Weber Carburator Manual.pdf - Power by BMW E21

5.2 layout of a com plete 44 IOF "PLUS" Weber duaJ carburetor kit
5.4 The project engine is a mostly stock VoN 1600 engine
with dual port heads
claiming th e main Weber distributo r has sub stant ially improved th e
dual 40 and 44 IOF kit s and th at th ey now have a bette r linkage
system . This necessitated a current inst allation feat ure in our
magazine, prompt ing us to probe deeper into the subject. What we did
next was co ntact one of Californi a's largest Weber deale rs, Fast
Freddy's, located at 2604 Harbor Bivd., Santa Ana, CA 92704; (714)
540-3801, and made arrangements to take delivery of t heir 44 IOF XE
"Plus" kits (refer to Fig. 5.2), along with an STE synchromeler carburetor
flow meter, a mandatory tool needed fo r tun ing the carburetors.
This would be a goo d tim e to add th at if you're looking fo r a
drastic increase in horsepower by simply bolting a dual carbureto r kit
onto your stock 1600 cc VoN engine, you've got another think coming.
Keep in mind that a profess ionally-assembled performance engine has
a "built-In" balance betw een cy linder heads, cam profile, exhaust
system and carbu retion. In othe r words , if you're looki ng for the best
results fro m a dual Weber carburetor kit, w e'd reco mmend that t he
engine d isplaces at least 1700 co, has a mild profile cam and some
degree of head work , along with an aftermarke t header system, and, of
course, you'l l need a mechanical advance distributor On our case we 'll
be usin g a Bosch OOg), as opposed t o a vacuum ad vance system
that' s used on stock \fIN engines.
The best way to begin is by laying out all the parts in the kit and
take account of everything. At this point, you will immediately notice
that you need a few more parts , as we did. That' s when we headed
do wn to Kymco Motorsport s, in Costa Mesa, CA, to round up some
extra parts as well as pick their brains as to any additional suggestions
they had for improving the installation. At this point you will also need
to make the decision of whether you want to retain the stock fu el
Part 1 Introduction Chapter 5 5-5
5.3 Use a brass T-sect ion in place of the plastic part
5.5 Remove the coo ling tin breast plate
pump, or switc h over to an elect ric pum p. If you choose to use an
elect ric pump. Facet offers an electric fuel pump rated in different fuel
flow increments. Weber carburetors require 1-1/2 to 3 PSI of delivery,
maximum. Therefore, the Facet UN 750-06 14 is the choice part, and
you will also need four 1/8-inch NPT fitt ings with 114-inch hose barbs
to complete the conversion.
An electric fuel pump should be mounted as close to the fuel tank
as possible, and beneath if as well, and should be mount ed using
some sort of rubber insulated padding. It just so happens that a pair of
\fIN Rabbit radiator mounts (part # 171 121 275E) work well and will
make the pump appear to run much quieter from inside the car. If you
decide to retain the stock fuel pum p, which is perfect ly fine, you wiil
need a mechanical fuel pressu re regulator stabilized betwee n 1-1/2
and 3 PSI for optimum results. While we were at Kymco we also picked
up a brass T-fitting and about S feet of stock fuel line, in addition to a
see-through fuel filter, which doubles as a junction for the smaller 5mm
f uel line and the larger 5/ 16-inch line to the carburetors. The
Weber kit includes a plastic T-section, but after a short period of use,
they are notorious for cracking; we all know how dangerous a fuel leak
is near the VoN engine, which is why we opted fo r a brass unit (refer to
Fig.5.3).
Now that you have everything you need, you can begin working
on the car (refer to Fig. 5.4). The previous mentioned order of operation
is very important, especially if you happen to be working on your only
form of transportation and otherwise have no way of retrieving needed
parts. Begin by removing the gas cap , and disconnecting the battery
cab les as well as the t hrott le cab le. The next order of business is
removi ng the air filter and cooling t in breast plate (refer to Fig. 5.5).
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